Impulse 8B45 - Manual

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SensorLex ™ 8B Isolated Analog Signal Conditioning Products 8B
8B45
Frequency Input Modules
Description
8B modules are an optimal solution for monitoring real-world process signals
and providing high level signals to a data acquisition system. Each 8B45 module
isolates and conditions a frequency input signal and provides an analog voltage
output.
The frequency input signal can be either a TTL level or zero crossing with as
little as ±100mV amplitude. Input circuitry for each signal type has built-in
hysteresis to prevent spurious noise from corrupting the module output. TTL
signals are applied to the + and – terminals while zero crossing signals are
applied to the +EXC and – terminals. Reference the block diagram below.
A 5V excitation is available for use with magnetic pick-up or contact closure type
sensors. The excitation is available on the –EXC terminal with return on the
– terminal.
A special input circuit on the 8B45 modules provides protection against
accidental connection of power-line voltages up to 240VAC. Clamp circuits on
the I/O and power terminals protect against harmful transients.
Isolation is provided by optical coupling to suppress transmission of common
mode spikes or surges. The module is powered from +5VDC, ±5%.
The modules are designed for installation in Class I, Division 2 hazardous
locations and have a high level of immunity to environmental noise.
Figure 1: 8B45 Block Diagram
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Features
• Accepts Frequency Input Signals 0 to 100kHz
• TTL or Zero-Crossing Signal Inputs
• High Level Voltage Outputs
• 1500Vrms Isolation
• ANSI/IEEE C37.90.1 Transient Protection
• Input Protected up to 240VAC Continuous
• 100dB CMR
• ±0.10% Accuracy
• ±0.05% Linearity
• Low Drift with Ambient Temperature
• UL Listing Pending
• Mix and Match Module Types on Backpanel